American Express purchased most of the assets of Kabbage, operator of a digital-first cash-flow technology platform for U.S. small businesses, in October 2020. By January of this year, Amex was testing Kabbage’s lines of credit and digital checking products with its small business customers. This month, nationwide marketing started for Kabbage Checking, a digital demand deposit account (DDA) aimed at Amex small business cardholders, select other Amex cardholders and small business owners who are not Amex cardholders, including those with lower annual revenues than the average Amex small b...